There is no difference. The joke is you just learned math.
One's a bird watcher and the other's a word botcher!
Everyone wants to be Irish on Saint Patrick's Day.
Most of the jokes in this subreddit.
There aren't jokes here. There are reposts here.
A: "Today children we will learn our ABC's"
They can only learn 4 moves.
You do the math"
Three. One to get the punchline, and one to point out the math is wrong.